Just stumbled on this fascinating experiment to take the power of LLVM and
build a new syntax that is binary and header file compatible with Objective-C.
Eero is a project by Andreas Arvanitis that tries to simplify the
syntax of Objective-C by using Python style indentation and adding a few extra
features that compile down to common Objective-C idioms. He’s working on an
Xcode plugin for syntax highliting and autocompletion support.

I don’t know how extensible Xcode is in this post Xcode 4/App Store bundle
world, but I’m keeping an eye on this one. If nothing else, it’s a beautiful
example of what you can do with the flexibility of LLVM and might be a hint
toward the kinds of modifications Apple could make to Objective-C to clean it
up. They’ve already been moving in this kind of direction.